病毒是只有少数基因和蛋白外壳的紧凑型生物实体，对生物工程有很大作用。
Compact biological entities with little more than a handful of genes and a protein coat, viruses lend themselves to engineering.
拉奥特说：“另一种可能是病毒并不会直接影响人类的细胞，而失去蛋白质外壳的病毒核糖核酸可能会通过一种类似于核糖核酸介素的组件选择细胞的功能。
One possibility, Raoult says, is that the virus does not infect human cells directly.
这种猫类缺少的蛋白质被认为能识别病毒外壳，并且瞄准病毒使之被降解。
The protein, which cats lack, is thought to recognize the virus's outer shell and target it to be degraded.
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